Many times, too, the manufacturer's recommended propeller is one that gives you the best combination of "reasonable" power output with good noise reduction. Usually, though, you can get more power and performance if you turn the engine faster with a different propeller. The result will be better aircraft performance.

For example, some .61-size engines recommend 12-inch propellers with 7 or 8 pitch. The engine's running in the low 11,000's or high 10,000's. Re-prop the engine to turn in the mid-12,000's, and the airplane may just start to "come alive". It all depends upon the engine/airplane combination, and whether the engine will actually turn that RPM and still give good throttle response.